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Derivatives and Hedging Activities - Narrative (Details) $ in Thousands, € in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2024 USD ($) | Mar. 31, 2024 USD ($) | Sep. 30, 2024 USD ($) | Dec. 31, 2024 EUR (€) | Dec. 31, 2024 USD ($) | Sep. 30, 2024 EUR (€) | Sep. 30, 2024 USD ($)
Designated as Hedging Instrument |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |
Unrealized gain expected to be recognized over the next 12 months |  |  |  |  | $ 1,566 |  |
Net investment hedges | Designated as Hedging Instrument |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  | 146,392 |  | $ 146,392
Interest Rate Swaps | Cash flow hedges | Designated as Hedging Instrument |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |
Unrealized gain on fair value of interest rate swaps, before tax | $ 1,132 | $ (2,606) |  |  |  |  |
Unrealized gain on fair value of interest rate swaps, after tax | 844 | (1,948) |  |  |  |  |
Derivative, notional amount |  |  |  |  | 175,000 |  | 175,000
LIBOR-Based Swap | Cash flow hedges | Designated as Hedging Instrument |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |
Unrecognized gain on LIBOR-based swaps | 3,076 | 3,848 |  |  |  |  |
Unrecognized gain on LIBOR-based swaps, after tax | 2,297 | $ 2,874 |  |  |  |  |
Cross-Currency Swaps |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |
Advance payments received from counterparties | 58,432 |  | $ 58,432 |  |  |  |
Cross-Currency Swaps | Net investment hedges | Designated as Hedging Instrument |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |
Net investment hedge, gain (loss), after reclassification, tax expense (benefit) | $ 863 |  | 2,156 |  |  |  |
Cross-Currency Swaps | Net investment hedges | Designated as Hedging Instrument | Other current liabilities |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |
Derivative liability, current |  |  |  |  | 17,416 |  | 17,416
Cross-Currency Swaps | Net investment hedges | Designated as Hedging Instrument | Other Liabilities |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |
Derivative liability, current |  |  |  |  | $ 41,016 |  | 41,016
Foreign currency debt instruments | Foreign Line of Credit |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |
Derivative, notional amount |  |  |  | € 0.0 |  | € 30.0 | $ 33,485
Foreign currency debt instruments | Net investment hedges | Designated as Hedging Instrument |  |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |
Currency losses |  |  | 3,820 |  |  |  |
Net investment hedge, gain (loss), after reclassification, tax expense (benefit) |  |  | $ (1,113) |  |  |  |

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- Definition Amount of after tax unrealized gain (loss) related to the increase or decrease in fair value of interest rate derivatives designated as cash flow hedging instruments, which was recorded in accumulated other comprehensive income to the extent that the cash flow hedge was determined to be effective. + References No definition available. + Details
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